Why Go: This opulent 75-room mansion was built in 1902 by Henry Flagler, the railroad tycoon who transformed Florida. Today, it’s a National Historic Landmark showcasing the luxury of the Gilded Age.

What to See: Marble staircases, Tiffany glass, period furnishings, and rotating exhibits on Florida’s history.

Tip: Allow 1–2 hours. Great for history lovers and anyone who enjoys grand architecture.